<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>数值计算</title>
</head>
<body>
<script>
    var firstNumber = 15;
    var secondNumber = 10;
    answer = 15 / 10;
    alert(answer);

    alert(15 / 10);

    answer = firstNumber / secondNumber;
    alert(answer);
</script>
</body>
</html>